HwaZiobro845 HwaZiobro845

04-06-2015
Mathematics

contestada

If x² - y² = 55, and x - y = 11, then y =
a. 8
b. 5
c. 3
d. -8
e. -3

Respuesta :

04-06-2015

x^2-y^2=55
this means that
(x+y)(x-y)=55
we know that x-y=11 so we can write
(x+y)(11)=55
x+y=55/11 we divide by 11 and we obtain
x+y=5

x-y=11 this means
x=y+11 we replace in the other equation (x+y=5)

y+11+y=5
2y=5-11
2y=-6
y=-3
and you find out that also
x=8

Answer Link

Otras preguntas

Find the solution to the system of equations. 21x+7y=42 -5x+5y=10

The value of y is directly proportional to the value of x. If y = 180 when x = 50, the value of y when x = 25?

7th-grade math help me, please

Which represents the equation 6x+3y = 12 when solved for y? O y=-2x+4 O Y=2x+4 O y=-2x-4 O y=2x-4

Sophie drove to the amusement park at a rate of 36 mph and arrived in 2.5 hours. How long will it take her to get home if Sophie drives 45 mph? I NEED IT DONE A

Find x. 24 ft X 10 ft ft

Which of the following is an example of an unhealthy online behavior? A. Posting photos of yourself drinking alcohol B. Posting your reviews of movies you've se

According to the text, how does the roaring twenties develop over time?

the diversity in culture aspects is our national pride?

Some chords are attracted to other cords. What is this called